Kenja no Mago

In modern Japan, a young man who dies in a road accident is reincarnated as a baby in another world. He is taken in by a man called the Sage, who names him Shin, raises him as his grandson, and teaches him magic. Thanks to the memories he has of his previous life and the magic taught by the Sage, he acquires extraordinary power. Fifteen years pass, but the Sage realizes that he forgot to teach him one thing: common sense! Indeed, Shin, who had focused exclusively on magic, knows nothing about this world. To remedy this problem and make friends, Shin enrolls in the magic academy. Everyone is astounded by his magic, his swordsmanship skills, and his unconventional knowledge.